High-precision 1H(e, elp)φ0 measurements at Q2 = 0.126 (GeV/c)2 are presented. It allows the determination of quadrupole amplitudes in the γ*N → △ transition, in which the reliability of electroproduction models was simultaneously tested. The derived quadrupole-to-dipole (I = 3/2) amplitude ratios, RSM = (-6.5 ± 0.2stat+sys ± 2.5mod)% and REM = (-2.1 ± 0.2stat+sys ± 2.0mod)%, are dominated by model error.
ASJC Scopus subject areas
- Physics and Astronomy(all)